M&S says

For a great night’s sleep, our fitted sheet is made with a Tencel® rich mix, which helps to keep your body temperature cool, as well as being a naturally breathable material. Sustainably crafted from the eucalyptus tree, Tencel® wicks moisture away from the skin, regulating your body temperature to give you a cool night’s sleep in luxurious comfort. This 200 thread count white sheet will fit mattress depths up to 26cm, and is easy to take on and off.

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Care and Composition

35 days to return
You may return unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.

How to return
Simply use our returns portal to print a returns label and returns note. You will then be able to return all or part of your order at your own cost through your preferred carrier. To create a returns label, visit our returns portal select this option and follow the instructions.